diff --git a/booking.module b/booking.module
index 2d0abcd..71dbcad 100644
--- a/booking.module
+++ b/booking.module
@@ -899,6 +899,7 @@ function booking_mail_alter(&$message) {
   foreach($headers as $key => $value) {
     $message['headers'][$key] = $value;
   }
+	watchdog('booking_debug', "<pre>Mail alter hook:\n@info</pre>", array('@info' => print_r( $message, true)));
 }
 
 /**